Issue/52 whitespace before langtag (#56)

* Fix issue with whitespace in turtle parser: Allow whitespace between quoted string literal and langtag or datatype
* Add testcase for whitespace between string literal and datatype iri

---------

Co-authored-by: Konrad Abicht <hi@inspirito.de>

lib/Parser/Turtle.php

@@ -554,6 +554,8 @@ protected function parseQuotedLiteral()
     {
         $label = $this->parseQuotedString();
 
+        $this->skipWSC();
+
         // Check for presence of a language tag or datatype
         $c = $this->peek();
 

test/fixtures/turtle/gh52-sweetrdf-whitespace-langtag.out

@@ -0,0 +1,2 @@
+<http://example.org/#a> <http://www.w3.org/2000/01/rdf-schema#label> "Test"@en .
+<http://example.org/#a> <http://www.w3.org/2000/01/rdf-schema#label> "Test"^^<http://www.w3.org/2001/XMLSchema#string> .

test/fixtures/turtle/gh52-sweetrdf-whitespace-langtag.ttl

@@ -0,0 +1,9 @@
+@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
+@prefix xs: <http://www.w3.org/2001/XMLSchema#> .
+@prefix : <http://example.org/#> .
+
+# Allow whitespace between literal and language tag
+:a rdfs:label "Test"      @en .
+
+# Allow whitespace between literal and datatype IRI
+:a rdfs:label "Test"      ^^xs:string .

tests/EasyRdf/Parser/TurtleTest.php

@@ -580,8 +580,9 @@ public function testIssue140()
     }
 
     /**
+     * Allow usage of dot in middle of name
+     *
      * @see https://github.com/sweetrdf/easyrdf/issues/51
-     * Notice this is an issue reported in the sweetrdf/easyrdf fork
      */
     public function testIssue51()
     {
@@ -597,4 +598,14 @@ public function testIssue51Bad()
         );
         $this->parseTurtle('turtle/gh51-sweetrdf-dot-in-name-bad.ttl');
     }
+
+    /**
+     * Allow whitespace(s) between quoted string literal and langtag or datatype
+     *
+     * @see https://github.com/sweetrdf/easyrdf/issues/52
+     */
+    public function testIssue52()
+    {
+        $this->turtleTestCase('gh52-sweetrdf-whitespace-langtag');
+    }
 }